US4283448A - Composite polytetrafluoroethylene article and a process for making the same - Google Patents
Composite polytetrafluoroethylene article and a process for making the same Download PDFInfo
- Publication number
- US4283448A US4283448A US06/121,365 US12136580A US4283448A US 4283448 A US4283448 A US 4283448A US 12136580 A US12136580 A US 12136580A US 4283448 A US4283448 A US 4283448A
- Authority
- US
- United States
- Prior art keywords
- segments
- microstructure
- ptfe
- polytetrafluoroethylene
- seam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 35
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 15
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 11
- 239000002131 composite material Substances 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000005304 joining Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000452 restraining effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920006358 Fluon Polymers 0.000 description 1
- 229920000544 Gore-Tex Polymers 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical class [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007631 vascular surgery Methods 0.000 description 1
Images
Classifications
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C08J5/121—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives by heating
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
- Y10T428/1331—Single layer [continuous layer]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/19—Sheets or webs edge spliced or joined
- Y10T428/192—Sheets or webs coplanar
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
Definitions
- This invention relates to a process for making a novel composite article of expanded polytetrafluoroethylene.
- PTFE Polytetrafluoroethylene
- This polymer has found wide use in medical, industrial and recreational fields.
- a recent invention provides a process for manufacturing highly porous, yet high strength, shaped, PTFE articles. This process involves blending highly crystalline, fine powder PTFE with a liquid lubricant, extruding this mixture through a die which may have desired cross-sectional configuration, and subsequently expanding the shaped article in one or more directions at rates in excess of 10% per second.
- An objective of the present invention is a process for producing a composite, shaped, PTFE article.
- Such an article is produced by joining segments of smaller-shaped articles. These smaller segments are held close together and their temperature raised to a temperature above the crystalline melt point of the segments. They are then allowed to cool to room temperature to facilitate handling of the article.
- a further objective of this invention is the production of a composite, shaped, PTFE article by the above process, with a virtually uninterrupted microstructure of nodes interconnected by fibrils across the join.
- FIG. 1 is a schematic illustration of one of the embodiments of the present invention.
- FIGS. 2-4(b) are electromicroscopic photographs of various surfaces of a tube produced in accordance with the invention.
- Bonding of PTFE to PTFE by mechanically holding the two parts in contact and heating them above the crystalline melt point of PTFE is known in the art. Generally, however, this has resulted in a solid non-porous seam.
- the present invention utilizes a modification of the process to produce a product in which the node-fibril microstructure present in both parts is maintained virtually uninterrupted across the seam. The result is that a seam-free product is produced.
- edges is used to refer to that portion of the expanded PTFE article which is to be bonded together and "seam” refers to the area so bonded.
- Articles refer to any shaped cross-section, e.g., tube, rod, sheet or segment.
- PTFE material is available in a variety of shapes, including sheets, rods and tubes from W. L. Gore & Associates, Inc.
- the articles to be bonded are cut to the required size. Care must be taken to ensure that the edges to be joined are clean, that is neither ragged or dirty. The two edges are then placed in close proximity, i.e., touching one another.
- a large tube can be made from sheets or sections from a number of smaller tubes.
- the sheets 4 are trimmed at their edges 6(a) and 6(b) to ensure that these edges are clean, that is, not ragged or dirty.
- the sheets 4 are then laid around a mandrel 2.
- the edges 6(a) and 6(b) of each sheet 4 are closely butted to the edges 6(a) and 6(b) of the adjoining sheet.
- the ends of the sheets, A and B are fixed at these points to the mandrel. This can be achieved in a variety of ways, such as hose clamps or tying the sheets to the mandrel by wire.
- the reason for so fixing the tube is to prevent longitudinal retraction of the PTFE on heating.
- a strip of expanded PTFE film about 0.75 inches wide and having a longitudinal Matrix Tensile Strength of about 70,000 p.s.i. is spirally wound around the sheets on the mandrel and fastened at the end of the mandrel so it cannot unwrap. Upon heating, this restraining film shrinks, applying pressure on the sheets and keeping the edges 6(a) and 6(b) in close contact.
- a satisfactory film is commercially available as GORE-TEX expanded filament from W. L. Gore & Associates, Inc., P.O. Box 1220, Elkton, Md. 29121.
- the heating of the wrapped tube can be achieved in a salt bath, an air oven, a radiant oven or other heating means.
- a suitable salt bath can be a molten mixture of sodium nitrites and nitrates and is maintained at a temperature above the crystalline melt point of the segments.
- the tube is then removed and allowed to cool while still being held restrained.
- the time above the crystalline melt point will vary depending on the mass of material involved and resin properties. The exact time to produce an optimum bond will depend on a number of factors such as mass of material and the configuration of the shape being produced. Such a time, however, is easily determined with a minimum of experimentation.
- the following example is intended to illustrate and not limit the present invention.
- the technique can be used in any of a variety of shapes and sizes where it is important to maintain a virtually uninterrupted microstructure across any joining line or seam.
- the mandrel was then placed in an air oven at 380° C. for 12 minutes. Upon removal from the air oven, the mandrel was allowed to cool to room temperature and the formed PTFE tube was carefully slid off the mandrel. For the purpose of this experiment, the wrapping film was carefully removed from the tube in order to photomicrograph the structure at the seam.
- FIG. 2 is an angled electromicroscopic photograph of one of the seams made in Example I.
- the top portion 10 is a topographical view of the inside surface of the tube.
- the bottom portion 12 is a cross-section view of the tube.
- the seam runs from X to Y.
- the magnification is 146 times.
- FIG. 3(a) is an electromicroscopic photograph of the inside surface of the tube made in Example I.
- the seam runs from X to Y.
- the magnification is 122 times.
- FIG. 3(b) is an electromicroscopic photograph of the inserted area in FIG. 3(a).
- the seam runs from X to Y and the magnification is 610 times.
- FIG. 4(a) is an electromicroscopic photograph of the outside surface, after removal of the film, of the tube made in Example I. The seam runs from X to Y and the magnification is 90 times.
- FIG. 4(b) is an electromicroscopic photograph of the inserted area shown in FIG. 4(a). The seam runs from X to Y and the magnification is 450 times.
- PTFE sheets Restrain the PTFE sheets in the direction of their expansion, butt them in place between 1/16" thick sheets of 60 durometer silicon rubber (two sheets of rubber on each side of the PTFE that are not quite butted together with a gap of about 0.010" between them which corresponds to the seam in the PTFE sheets), and place the PTFE and rubber sheets in a press with platens heated to about 380° C.
- the press could be closed to apply a very small pressure to the sheets sitting on the rubber. This would supply the necessary perpendicular force to the seam, this time in a planar configuration.
- the electrical heaters on the press could be turned off and the platens cooled by a stream of compressed air. When the platens had cooled to room temperature, the pressure could be released and the sheets removed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Transplantation (AREA)
- Vascular Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Gastroenterology & Hepatology (AREA)
- Pulmonology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Manufacturing & Machinery (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Toxicology (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Prostheses (AREA)
- Laminated Bodies (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
A porous polytetrafluoroethylene (PTFE) article which is made up of a number of smaller articles with a microstructure of nodes interconnected by fibrils, these articles having been joined to one another such that their microstructure is virtually unaltered across the join. A process for producing such a PTFE article by closely abutting small-shaped PTFE segments and applying a force perpendicular to the seam while heating to a temperature above the crystalline melt point of the segments.
Description
This invention relates to a process for making a novel composite article of expanded polytetrafluoroethylene.
Polytetrafluoroethylene (hereinafter "PTFE") has excellent heat resistance, chemical resistance, insulation resistance, non-adhesiveness and self-lubrication. This polymer has found wide use in medical, industrial and recreational fields.
A recent invention (U.S. Pat. No. 3,953,566) provides a process for manufacturing highly porous, yet high strength, shaped, PTFE articles. This process involves blending highly crystalline, fine powder PTFE with a liquid lubricant, extruding this mixture through a die which may have desired cross-sectional configuration, and subsequently expanding the shaped article in one or more directions at rates in excess of 10% per second.
Products produced by this process have found widespread acceptance in the industrial, medical, electrical, and clothing arts. The process is somewhat limited in that it is not readily adaptable to the production of large articles with complex cross-sections. A need for such articles is found, for example, in the industrial filtration arts and in large vessel vascular surgery. Although large composite articles can be manufactured by joining smaller articles together by such conventional methods as sewing, welding or gluing, such articles have a discontinuity at the seam. While in many applications this does not present any severe problems, in others such as filtration and body part replacement, it is extremely important that the structure be as uniform as possible over the entire article. If welding or gluing is used to produce large articles, a dense non-porous area is produced. On the other hand, sewing may produce areas which have a greater porosity than the rest of the article. It has been found that the microstructure of nodes and fibrils present in products produced by U.S. Pat. No. 3,953,566 is particularly desirable as both a filter media and as surface for contacting blood and other body fluids. It would, therefore, be desirable to produce composite, complex shapes by joining articles of expanded PTFE with this microstructure in such a manner that the microstructure remains virtually uninterrupted across the join or seam.
An objective of the present invention is a process for producing a composite, shaped, PTFE article. Such an article is produced by joining segments of smaller-shaped articles. These smaller segments are held close together and their temperature raised to a temperature above the crystalline melt point of the segments. They are then allowed to cool to room temperature to facilitate handling of the article. A further objective of this invention is the production of a composite, shaped, PTFE article by the above process, with a virtually uninterrupted microstructure of nodes interconnected by fibrils across the join.
FIG. 1 is a schematic illustration of one of the embodiments of the present invention.
FIGS. 2-4(b) are electromicroscopic photographs of various surfaces of a tube produced in accordance with the invention.
Bonding of PTFE to PTFE by mechanically holding the two parts in contact and heating them above the crystalline melt point of PTFE is known in the art. Generally, however, this has resulted in a solid non-porous seam. The present invention utilizes a modification of the process to produce a product in which the node-fibril microstructure present in both parts is maintained virtually uninterrupted across the seam. The result is that a seam-free product is produced. In the present context, the term "edges" is used to refer to that portion of the expanded PTFE article which is to be bonded together and "seam" refers to the area so bonded. Articles refer to any shaped cross-section, e.g., tube, rod, sheet or segment.
PTFE material is available in a variety of shapes, including sheets, rods and tubes from W. L. Gore & Associates, Inc. The articles to be bonded are cut to the required size. Care must be taken to ensure that the edges to be joined are clean, that is neither ragged or dirty. The two edges are then placed in close proximity, i.e., touching one another.
If expanded PTFE is heated above its crystalline melt point while unrestrained, the material will tend to shrink and coalesce into a solid mass. In order, therefore, to ensure that the two articles to be bonded together remain in contact while being heated, mechanical means must be employed to so hold them.
For example, as illustrated in FIG. 1, a large tube can be made from sheets or sections from a number of smaller tubes. The sheets 4 are trimmed at their edges 6(a) and 6(b) to ensure that these edges are clean, that is, not ragged or dirty. The sheets 4 are then laid around a mandrel 2. The edges 6(a) and 6(b) of each sheet 4 are closely butted to the edges 6(a) and 6(b) of the adjoining sheet. The ends of the sheets, A and B, are fixed at these points to the mandrel. This can be achieved in a variety of ways, such as hose clamps or tying the sheets to the mandrel by wire. The reason for so fixing the tube, is to prevent longitudinal retraction of the PTFE on heating.
A strip of expanded PTFE film about 0.75 inches wide and having a longitudinal Matrix Tensile Strength of about 70,000 p.s.i. is spirally wound around the sheets on the mandrel and fastened at the end of the mandrel so it cannot unwrap. Upon heating, this restraining film shrinks, applying pressure on the sheets and keeping the edges 6(a) and 6(b) in close contact. A satisfactory film is commercially available as GORE-TEX expanded filament from W. L. Gore & Associates, Inc., P.O. Box 1220, Elkton, Md. 29121. Although wrapping with an expanded PTFE film is a preferred means of mechanically restraining and holding the edges of the sheets in contact during heating, other means may be used.
The important factor is that there must be some force perpendicular to the seam during sintering. When the film wrapped around the tube retracts, it supplies the necessary force.
The heating of the wrapped tube can be achieved in a salt bath, an air oven, a radiant oven or other heating means. A suitable salt bath can be a molten mixture of sodium nitrites and nitrates and is maintained at a temperature above the crystalline melt point of the segments. The tube is then removed and allowed to cool while still being held restrained. The time above the crystalline melt point will vary depending on the mass of material involved and resin properties. The exact time to produce an optimum bond will depend on a number of factors such as mass of material and the configuration of the shape being produced. Such a time, however, is easily determined with a minimum of experimentation. The following example is intended to illustrate and not limit the present invention. The technique can be used in any of a variety of shapes and sizes where it is important to maintain a virtually uninterrupted microstructure across any joining line or seam.
Three 6.5 cm long, 120° segments were cut from 20 mm inside diameter tubes which had been produced according to the teachings of U.S. Pat. No. 3,953,566. The resin used was Fluon 123 which is a fine powder, PTFE resin commercially available from ICI America. These segments were carefully trimmed to ensure that the edges to be butted were clean. The segments were then carefully laid around a smooth, 20 mm O.D., stainless steel tube. The segments were arranged so that they butted closely together. They were then spirally wrapped with a 0.75 inch wide expanded PTFE film having a Matrix Tensile Strength of about 70,000 p.s.i. which was manufactured according to U.S. Pat. No. 3,962,153.
The mandrel was then placed in an air oven at 380° C. for 12 minutes. Upon removal from the air oven, the mandrel was allowed to cool to room temperature and the formed PTFE tube was carefully slid off the mandrel. For the purpose of this experiment, the wrapping film was carefully removed from the tube in order to photomicrograph the structure at the seam.
FIG. 2 is an angled electromicroscopic photograph of one of the seams made in Example I. The top portion 10, is a topographical view of the inside surface of the tube. The bottom portion 12, is a cross-section view of the tube. In FIG. 2, the seam runs from X to Y. The magnification is 146 times.
FIG. 3(a) is an electromicroscopic photograph of the inside surface of the tube made in Example I. The seam runs from X to Y. The magnification is 122 times. FIG. 3(b) is an electromicroscopic photograph of the inserted area in FIG. 3(a). The seam runs from X to Y and the magnification is 610 times.
FIG. 4(a) is an electromicroscopic photograph of the outside surface, after removal of the film, of the tube made in Example I. The seam runs from X to Y and the magnification is 90 times. FIG. 4(b) is an electromicroscopic photograph of the inserted area shown in FIG. 4(a). The seam runs from X to Y and the magnification is 450 times.
From these electromicroscopic photographs, it is surprising to observe that the node-fibril microstructure is virtually uninterrupted across the seam. Although a small scale example was used to illustrate this invention, this technique can be readily extended to cover large tubes up to several inches in diameter. Equally, the technique can be used with any of a variety of shapes and is not limited to tubular cross-sections. For example, sheets of uniaxially expanded PTFE with thicknesses ranging from about 0.005" to more than 0.100" could be joined together in the following manner. Restrain the PTFE sheets in the direction of their expansion, butt them in place between 1/16" thick sheets of 60 durometer silicon rubber (two sheets of rubber on each side of the PTFE that are not quite butted together with a gap of about 0.010" between them which corresponds to the seam in the PTFE sheets), and place the PTFE and rubber sheets in a press with platens heated to about 380° C. The press could be closed to apply a very small pressure to the sheets sitting on the rubber. This would supply the necessary perpendicular force to the seam, this time in a planar configuration. After an appropriate time, approximately 15 minutes, the electrical heaters on the press could be turned off and the platens cooled by a stream of compressed air. When the platens had cooled to room temperature, the pressure could be released and the sheets removed.
Claims (4)
1. A process for joining a plurality of shrinkable expanded porous polytetrafluoroethylene segments, each having a microstructure of nodes interconnected by fibrils, such that the microstructure is virtually uninterrupted at the seam joining said segments, comprising the steps of:
(a) arranging said segments such that their edges are disposed in abutting relationship;
(b) causing a pressure to be applied perpindicular to said abutting edges;
(c) causing said segments to be restrained from shrinking in any direction;
(d) heating said segments while they are so held, to a temperature above the crystalline melt point of polytetrafluoroethylene for a predetermined time; and
(e) allowing said segments to cool while still being held restrained and under pressure.
2. A composite article made in accordance with claim 1.
3. A method for manufacturing a porous composite tube from a plurality of segments of shrinkable expanded porous polytetrafluoroethylene, each having a microstructure of nodes interconnected by fibrils such that the microstructure is virtually uninterrupted at the seam joining said segments comprising the steps of:
(a) forming a tube of expanded porous polytetrafluoroethylene segments by disposing said segments around a suitable mandrel in abutting relationship;
(b) winding a film of high strength shrinkable expanded porous polytetrafluoroethylene with a microstructure of nodes interconnected by fibrils around said segments;
(c) restraining said segments from shrinking longitudinally;
(d) bonding and shrinking said film to said segment, thereby applying pressure perpindicular to the edge of said segments by heating to a temperature above the crystalline melt point of polytetrafluoroethylene for a predetermined time; and
(e) allowing said wrapped bonded segments to cool.
4. A composite article made in accordance with claim 3.
Priority Applications (21)
Application Number | Priority Date | Filing Date | Title |
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US06/121,365 US4283448A (en) | 1980-02-14 | 1980-02-14 | Composite polytetrafluoroethylene article and a process for making the same |
SE8100407A SE448968B (en) | 1980-02-14 | 1981-01-23 | COMPOSITION PRODUCT OF EXPANDED POLYTETRAFLUORET AND METHOD OF PREPARING ITS SAME |
ZA00810678A ZA81678B (en) | 1980-02-14 | 1981-02-02 | A composite polytetrafluoroethylene article and process for making the same |
DE3104037A DE3104037C2 (en) | 1980-02-14 | 1981-02-05 | Process for the manufacture of a porous tube from expanded porous PTFE |
DE3153231A DE3153231C2 (en) | 1980-02-14 | 1981-02-05 | |
GB8103585A GB2068827B (en) | 1980-02-14 | 1981-02-05 | Composite polytetrafluoroethylene article and a method for its manufacture |
CH888/81A CH652072A5 (en) | 1980-02-14 | 1981-02-10 | PRODUCT FROM POLYTETRAFLUORAETHYLENE AND METHOD FOR THE PRODUCTION THEREOF. |
AU67146/81A AU541290B2 (en) | 1980-02-14 | 1981-02-10 | Joining foam plastic |
IT19659/81A IT1135417B (en) | 1980-02-14 | 1981-02-11 | POLITETRAFLUOROETILENE COMPOSITE ITEM AND PROCESS FOR ITS MANUFACTURE |
BR8100852A BR8100852A (en) | 1980-02-14 | 1981-02-12 | PROCESS FOR JOINING A PLURALITY OF POLITETRAFLUORETHYLENE SEGMENTS; COMPOSITE PTFE ARTICLE AND COMPOSITE PTFE PRODUCT |
GR64113A GR73849B (en) | 1980-02-14 | 1981-02-12 | |
NLAANVRAGE8100672,A NL185906C (en) | 1980-02-14 | 1981-02-12 | METHOD FOR WELDING A MULTIPLE OF POLYTETRAFLUORETHANE SEGMENTS AND COMPOSITE PRODUCTION THEREOF |
BE0/203784A BE887501A (en) | 1980-02-14 | 1981-02-12 | POLYTETRAFLUOROETHYLENE COMPOSITE MANUFACTURED PRODUCT AND PROCESS FOR PRODUCING THE SAME |
DK063581A DK156419C (en) | 1980-02-14 | 1981-02-13 | PROCEDURE FOR PREPARING A POROEST TUBE OF STRONG POROEST POLYTETRAFLUORETHYLENE |
FR8102848A FR2475974B1 (en) | 1980-02-14 | 1981-02-13 | POLYETRAFLUOROETHYLENE COMPOSITE ARTICLE AND PREPARATION METHOD |
NO810506A NO810506L (en) | 1980-02-14 | 1981-02-13 | PROCEDURE FOR PREPARING POLYTETRAFLUORETHYL STANDARDS |
FI810449A FI72920C (en) | 1980-02-14 | 1981-02-13 | FOERFARANDE FOER FRAMSTAELLNING AV EN KOMBINATIONSPRODUKT AV POLYTETRAFLUORETEN. |
CA000370903A CA1165080A (en) | 1980-02-14 | 1981-02-13 | Composite polytetrafluoroethylene article and a process for making the same |
JP56019161A JPS5746835A (en) | 1980-02-14 | 1981-02-13 | Method of bonding polytetrafluoroethylene article |
IN167/CAL/81A IN155688B (en) | 1980-02-14 | 1981-02-13 | |
AT0071181A AT386416B (en) | 1980-02-14 | 1981-02-16 | COMPOSED POLYTETRAFLUORETHYLENE OBJECT AND METHOD FOR THE PRODUCTION THEREOF |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US06/121,365 US4283448A (en) | 1980-02-14 | 1980-02-14 | Composite polytetrafluoroethylene article and a process for making the same |
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Country Status (20)
Country | Link |
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US (1) | US4283448A (en) |
JP (1) | JPS5746835A (en) |
AT (1) | AT386416B (en) |
AU (1) | AU541290B2 (en) |
BE (1) | BE887501A (en) |
BR (1) | BR8100852A (en) |
CA (1) | CA1165080A (en) |
CH (1) | CH652072A5 (en) |
DE (2) | DE3153231C2 (en) |
DK (1) | DK156419C (en) |
FI (1) | FI72920C (en) |
FR (1) | FR2475974B1 (en) |
GB (1) | GB2068827B (en) |
GR (1) | GR73849B (en) |
IN (1) | IN155688B (en) |
IT (1) | IT1135417B (en) |
NL (1) | NL185906C (en) |
NO (1) | NO810506L (en) |
SE (1) | SE448968B (en) |
ZA (1) | ZA81678B (en) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4371554A (en) * | 1979-11-09 | 1983-02-01 | Ashland Food Technology Holdings S.A. | Method of making skinless sausage using reusable porous polytetrafluoroethylene casing |
US4385093A (en) * | 1980-11-06 | 1983-05-24 | W. L. Gore & Associates, Inc. | Multi-component, highly porous, high strength PTFE article and method for manufacturing same |
US4463329A (en) * | 1978-08-15 | 1984-07-31 | Hirosuke Suzuki | Dielectric waveguide |
US4478665A (en) * | 1980-11-06 | 1984-10-23 | W. L. Gore & Associates, Inc. | Method for manufacturing highly porous, high strength PTFE articles |
US4547424A (en) * | 1984-04-10 | 1985-10-15 | Junkosha Company, Ltd. | Compression resistant expanded, porous polytetrafluoroethylene composite |
US4557957A (en) * | 1983-03-18 | 1985-12-10 | W. L. Gore & Associates, Inc. | Microporous metal-plated polytetrafluoroethylene articles and method of manufacture |
US4701291A (en) * | 1986-07-25 | 1987-10-20 | The Duriron Company, Inc. | Process of isostatic molding and bonding fluoropolymers |
US4787921A (en) * | 1986-06-13 | 1988-11-29 | Japan Gore-Tex, Inc. | Degassing tube |
US4790090A (en) * | 1987-04-30 | 1988-12-13 | Sharber Norman G | Fish tag |
US4973609A (en) * | 1988-11-17 | 1990-11-27 | Memron, Inc. | Porous fluoropolymer alloy and process of manufacture |
US4990296A (en) * | 1989-08-21 | 1991-02-05 | Garlock Inc. | Welding of filled sintered polytetrafluoroethylene |
US5219894A (en) * | 1984-12-25 | 1993-06-15 | Sumitomo Electric Industries, Ltd. | Method for treating the surface of a thin porous film material |
US5245134A (en) * | 1990-08-29 | 1993-09-14 | W. L. Gore & Associates, Inc. | Polytetrafluoroethylene multiconductor cable and process for manufacture thereof |
US5296510A (en) * | 1984-12-25 | 1994-03-22 | Sumitomo Electric Industries Ltd. | Method for treating the surface of a thin porous film material of tetrafluoroethylene resin |
US5474824A (en) * | 1992-03-13 | 1995-12-12 | Atrium Medical Corporation | Process for expanding polytetrafluoroethylene and products produced thereby |
US5478423A (en) * | 1993-09-28 | 1995-12-26 | W. L. Gore & Associates, Inc. | Method for making a printer release agent supply wick |
US5497809A (en) * | 1994-01-05 | 1996-03-12 | Wolf; Lawrence W. | Vented bending sleeves for coaxial tubing systems |
US5607478A (en) * | 1996-03-14 | 1997-03-04 | Meadox Medicals Inc. | Yarn wrapped PTFE tubular prosthesis |
US5609624A (en) * | 1993-10-08 | 1997-03-11 | Impra, Inc. | Reinforced vascular graft and method of making same |
US5746856A (en) * | 1992-04-10 | 1998-05-05 | W. L. Gore & Associates, Inc. | Method of ultrasonically welding articles of porous polytetrafluoroethylene |
US5814175A (en) * | 1995-06-07 | 1998-09-29 | Edlon Inc. | Welded thermoplastic polymer article and a method and apparatus for making same |
US5869156A (en) * | 1991-06-04 | 1999-02-09 | Donaldson Company, Inc. | Porous products manufactured from polytetrafluoroethylene treated with a perfluoroether fluid and method of manufacturing such products |
US6228204B1 (en) * | 1998-02-05 | 2001-05-08 | Crane Co. | Method and apparatus for welding together fluoropolymer pipe liners |
US6341625B1 (en) * | 2000-01-10 | 2002-01-29 | Kanagawa Toyota Motor Sales Co., Ltd. | Hydraulic brake hose assembly for bicycles |
US6620190B1 (en) | 1994-05-06 | 2003-09-16 | Impra, Inc., A Subsidiary Of C.R. Bard, Inc. | Radially expandable polytetrafluoroethylene |
US20040026819A1 (en) * | 2002-08-09 | 2004-02-12 | The Boeing Company | Post-forming of thermoplastic ducts |
US20040157024A1 (en) * | 1994-06-27 | 2004-08-12 | Colone William M. | Radially expandable polytetrafluoroethylene |
US20050153121A1 (en) * | 1999-08-12 | 2005-07-14 | Bridger Biomed, Inc. | PTFE material with aggregations of nodes |
US20090053371A1 (en) * | 2007-08-21 | 2009-02-26 | Carolie Hancock | Package for storing, shipping, preparing and dispensing a meal |
US20100131041A1 (en) * | 1993-08-18 | 2010-05-27 | Lewis James D | Intraluminal Stent Graft |
US20100219265A1 (en) * | 2007-07-09 | 2010-09-02 | Tanhum Feld | Water irrigation system including drip irrigation emitters |
US8029563B2 (en) | 2004-11-29 | 2011-10-04 | Gore Enterprise Holdings, Inc. | Implantable devices with reduced needle puncture site leakage |
CN105829415A (en) * | 2013-11-29 | 2016-08-03 | 大金工业株式会社 | Porous body, polymer electrolyte membrane, filter material for filter, and filter unit |
US20170049928A1 (en) * | 2015-08-17 | 2017-02-23 | Vivex Biomedical, Inc. | Umbilical cord transplant product |
US9814560B2 (en) | 2013-12-05 | 2017-11-14 | W. L. Gore & Associates, Inc. | Tapered implantable device and methods for making such devices |
US10357385B2 (en) | 2015-06-05 | 2019-07-23 | W. L. Gore & Associates, Inc. | Low bleed implantable prosthesis with a taper |
US11378214B2 (en) | 2020-06-26 | 2022-07-05 | Lawrence Wolf | Coaxial tubing systems with securable spacers |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63134092A (en) * | 1986-11-23 | 1988-06-06 | Takanori Shigee | Sterilizer for water of elevated water tank |
FR2644103B1 (en) * | 1989-03-10 | 1995-01-13 | Eberle Jean Marie | PROCESS FOR MANUFACTURING A BODY OF A TUBULAR PACKAGE, PACKAGE THUS OBTAINED AND DEVICE FOR CARRYING OUT SAID METHOD |
CA2169549C (en) * | 1993-08-18 | 2000-07-11 | James D. Lewis | A tubular intraluminal graft |
US5641373A (en) * | 1995-04-17 | 1997-06-24 | Baxter International Inc. | Method of manufacturing a radially-enlargeable PTFE tape-reinforced vascular graft |
GB0511431D0 (en) | 2005-06-04 | 2005-07-13 | Vascutek Ltd | Graft |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US612897A (en) * | 1898-10-25 | Construction of tubes and cylinders | ||
US3207644A (en) * | 1959-07-20 | 1965-09-21 | Garlock Inc | Method of making a fluorocarbon resin jacketed gasket |
US3767500A (en) * | 1971-12-28 | 1973-10-23 | Tme Corp | Method of laminating long strips of various materials |
US3953566A (en) * | 1970-05-21 | 1976-04-27 | W. L. Gore & Associates, Inc. | Process for producing porous products |
US4061517A (en) * | 1975-08-27 | 1977-12-06 | Chemelec Products, Inc. | Method of making fluorocarbon resin covered gaskets |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3356551A (en) * | 1961-08-21 | 1967-12-05 | Martin Marietta Corp | Method of joining bodies of polytetrafluoroethylene |
DE2549475C3 (en) * | 1975-11-05 | 1979-04-19 | Sigri Elektrographit Gmbh, 8901 Meitingen | Method and device for connecting molded bodies made of polytetrafluoroethylene |
-
1980
- 1980-02-14 US US06/121,365 patent/US4283448A/en not_active Expired - Lifetime
-
1981
- 1981-01-23 SE SE8100407A patent/SE448968B/en not_active IP Right Cessation
- 1981-02-02 ZA ZA00810678A patent/ZA81678B/en unknown
- 1981-02-05 DE DE3153231A patent/DE3153231C2/de not_active Expired
- 1981-02-05 DE DE3104037A patent/DE3104037C2/en not_active Expired
- 1981-02-05 GB GB8103585A patent/GB2068827B/en not_active Expired
- 1981-02-10 AU AU67146/81A patent/AU541290B2/en not_active Ceased
- 1981-02-10 CH CH888/81A patent/CH652072A5/en not_active IP Right Cessation
- 1981-02-11 IT IT19659/81A patent/IT1135417B/en active
- 1981-02-12 BE BE0/203784A patent/BE887501A/en unknown
- 1981-02-12 NL NLAANVRAGE8100672,A patent/NL185906C/en not_active IP Right Cessation
- 1981-02-12 GR GR64113A patent/GR73849B/el unknown
- 1981-02-12 BR BR8100852A patent/BR8100852A/en unknown
- 1981-02-13 FR FR8102848A patent/FR2475974B1/en not_active Expired
- 1981-02-13 JP JP56019161A patent/JPS5746835A/en active Granted
- 1981-02-13 DK DK063581A patent/DK156419C/en not_active IP Right Cessation
- 1981-02-13 IN IN167/CAL/81A patent/IN155688B/en unknown
- 1981-02-13 FI FI810449A patent/FI72920C/en not_active IP Right Cessation
- 1981-02-13 CA CA000370903A patent/CA1165080A/en not_active Expired
- 1981-02-13 NO NO810506A patent/NO810506L/en unknown
- 1981-02-16 AT AT0071181A patent/AT386416B/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US612897A (en) * | 1898-10-25 | Construction of tubes and cylinders | ||
US3207644A (en) * | 1959-07-20 | 1965-09-21 | Garlock Inc | Method of making a fluorocarbon resin jacketed gasket |
US3953566A (en) * | 1970-05-21 | 1976-04-27 | W. L. Gore & Associates, Inc. | Process for producing porous products |
US3767500A (en) * | 1971-12-28 | 1973-10-23 | Tme Corp | Method of laminating long strips of various materials |
US4061517A (en) * | 1975-08-27 | 1977-12-06 | Chemelec Products, Inc. | Method of making fluorocarbon resin covered gaskets |
Cited By (67)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4463329A (en) * | 1978-08-15 | 1984-07-31 | Hirosuke Suzuki | Dielectric waveguide |
US4371554A (en) * | 1979-11-09 | 1983-02-01 | Ashland Food Technology Holdings S.A. | Method of making skinless sausage using reusable porous polytetrafluoroethylene casing |
US4385093A (en) * | 1980-11-06 | 1983-05-24 | W. L. Gore & Associates, Inc. | Multi-component, highly porous, high strength PTFE article and method for manufacturing same |
US4478665A (en) * | 1980-11-06 | 1984-10-23 | W. L. Gore & Associates, Inc. | Method for manufacturing highly porous, high strength PTFE articles |
US4557957A (en) * | 1983-03-18 | 1985-12-10 | W. L. Gore & Associates, Inc. | Microporous metal-plated polytetrafluoroethylene articles and method of manufacture |
US4547424A (en) * | 1984-04-10 | 1985-10-15 | Junkosha Company, Ltd. | Compression resistant expanded, porous polytetrafluoroethylene composite |
US5219894A (en) * | 1984-12-25 | 1993-06-15 | Sumitomo Electric Industries, Ltd. | Method for treating the surface of a thin porous film material |
US5252626A (en) * | 1984-12-25 | 1993-10-12 | Sumitomo Electric Industries Inc. | Method for treating the surface of a thin porous film material |
US5296510A (en) * | 1984-12-25 | 1994-03-22 | Sumitomo Electric Industries Ltd. | Method for treating the surface of a thin porous film material of tetrafluoroethylene resin |
US4787921A (en) * | 1986-06-13 | 1988-11-29 | Japan Gore-Tex, Inc. | Degassing tube |
US4701291A (en) * | 1986-07-25 | 1987-10-20 | The Duriron Company, Inc. | Process of isostatic molding and bonding fluoropolymers |
US4790090A (en) * | 1987-04-30 | 1988-12-13 | Sharber Norman G | Fish tag |
US4973609A (en) * | 1988-11-17 | 1990-11-27 | Memron, Inc. | Porous fluoropolymer alloy and process of manufacture |
US4990296A (en) * | 1989-08-21 | 1991-02-05 | Garlock Inc. | Welding of filled sintered polytetrafluoroethylene |
DE4017691A1 (en) * | 1989-08-21 | 1991-02-28 | Garlock Inc | WELDING SINTERED, FILLED POLYTETRAFLUORAETHYLENE |
US5245134A (en) * | 1990-08-29 | 1993-09-14 | W. L. Gore & Associates, Inc. | Polytetrafluoroethylene multiconductor cable and process for manufacture thereof |
US5869156A (en) * | 1991-06-04 | 1999-02-09 | Donaldson Company, Inc. | Porous products manufactured from polytetrafluoroethylene treated with a perfluoroether fluid and method of manufacturing such products |
US5972449A (en) * | 1991-06-04 | 1999-10-26 | Donaldson Company, Inc. | Porous products manufactured from polytetrafluoroethylene treated with a perfluoroether fluid and methods of manufacturing such products |
US5474824A (en) * | 1992-03-13 | 1995-12-12 | Atrium Medical Corporation | Process for expanding polytetrafluoroethylene and products produced thereby |
US5746856A (en) * | 1992-04-10 | 1998-05-05 | W. L. Gore & Associates, Inc. | Method of ultrasonically welding articles of porous polytetrafluoroethylene |
US8197531B2 (en) | 1993-08-18 | 2012-06-12 | W.L. Gore & Associates, Inc. | Intraluminal stent graft |
US20100217375A1 (en) * | 1993-08-18 | 2010-08-26 | Lewis James D | Intraluminal Stent Graft |
US20100218885A1 (en) * | 1993-08-18 | 2010-09-02 | Lewis James D | Intraluminal Stent Graft |
US8080051B2 (en) | 1993-08-18 | 2011-12-20 | Gore Enterprise Holdings, Inc. | Intraluminal stent graft |
US20100222874A1 (en) * | 1993-08-18 | 2010-09-02 | Lewis James D | Intraluminal Stent Graft |
US20100212809A1 (en) * | 1993-08-18 | 2010-08-26 | Lewis James D | Intraluminal Stent Graft |
US20100222865A1 (en) * | 1993-08-18 | 2010-09-02 | Lewis James D | Intraluminal Stent Graft |
US20100131041A1 (en) * | 1993-08-18 | 2010-05-27 | Lewis James D | Intraluminal Stent Graft |
US8197530B2 (en) | 1993-08-18 | 2012-06-12 | W. L. Gore & Associates, Inc. | Intraluminal stent graft |
US8221487B2 (en) | 1993-08-18 | 2012-07-17 | W. L. Gore & Associates, Inc. | Intraluminal stent graft |
US20100218882A1 (en) * | 1993-08-18 | 2010-09-02 | Lewis James D | Intraluminal Stent Graft |
US8197532B2 (en) | 1993-08-18 | 2012-06-12 | W. L. Gore & Associates, Inc. | Intraluminal stent graft |
US8221488B2 (en) | 1993-08-18 | 2012-07-17 | W. L. Gore & Associates, Inc. | Intraluminal stent graft |
US5478423A (en) * | 1993-09-28 | 1995-12-26 | W. L. Gore & Associates, Inc. | Method for making a printer release agent supply wick |
US5690739A (en) * | 1993-09-28 | 1997-11-25 | W. L. Gore & Associates, Inc. | Release agent supply wick for printer apparatus and method for making and using same |
US5709748A (en) * | 1993-09-28 | 1998-01-20 | W. L. Gore & Associates, Inc. | Release agent supply wick for printer apparatus |
US5609624A (en) * | 1993-10-08 | 1997-03-11 | Impra, Inc. | Reinforced vascular graft and method of making same |
US5497809A (en) * | 1994-01-05 | 1996-03-12 | Wolf; Lawrence W. | Vented bending sleeves for coaxial tubing systems |
US6620190B1 (en) | 1994-05-06 | 2003-09-16 | Impra, Inc., A Subsidiary Of C.R. Bard, Inc. | Radially expandable polytetrafluoroethylene |
US20080143011A1 (en) * | 1994-06-27 | 2008-06-19 | Colone William M | Radially expandable polytetrafluoroethylene |
US7465483B2 (en) | 1994-06-27 | 2008-12-16 | C.R.Bard Inc. | Radially expandable polytetrafluoroethylene |
US20040157024A1 (en) * | 1994-06-27 | 2004-08-12 | Colone William M. | Radially expandable polytetrafluoroethylene |
US8158041B2 (en) | 1994-06-27 | 2012-04-17 | Bard Peripheral Vascular, Inc. | Radially expandable polytetrafluoroethylene |
US5814175A (en) * | 1995-06-07 | 1998-09-29 | Edlon Inc. | Welded thermoplastic polymer article and a method and apparatus for making same |
US6080198A (en) * | 1996-03-14 | 2000-06-27 | Meadox Medicals, Inc. | Method for forming a yarn wrapped PTFE tubular prosthesis |
US5607478A (en) * | 1996-03-14 | 1997-03-04 | Meadox Medicals Inc. | Yarn wrapped PTFE tubular prosthesis |
US6228204B1 (en) * | 1998-02-05 | 2001-05-08 | Crane Co. | Method and apparatus for welding together fluoropolymer pipe liners |
US7306841B2 (en) | 1999-08-12 | 2007-12-11 | Bridger Biomed, Inc. | PTFE material with aggregations of nodes |
US20050153121A1 (en) * | 1999-08-12 | 2005-07-14 | Bridger Biomed, Inc. | PTFE material with aggregations of nodes |
US6341625B1 (en) * | 2000-01-10 | 2002-01-29 | Kanagawa Toyota Motor Sales Co., Ltd. | Hydraulic brake hose assembly for bicycles |
US20040026819A1 (en) * | 2002-08-09 | 2004-02-12 | The Boeing Company | Post-forming of thermoplastic ducts |
US20070013105A1 (en) * | 2002-08-09 | 2007-01-18 | The Boeing Company | Post-Forming of Thermoplastic Ducts |
US7128558B2 (en) | 2002-08-09 | 2006-10-31 | The Boeing Company | Post-forming of thermoplastic ducts |
EP1388409A3 (en) * | 2002-08-09 | 2004-05-19 | The Boeing Company | Apparatus and method for post-forming thermoplastic ducts |
US8029563B2 (en) | 2004-11-29 | 2011-10-04 | Gore Enterprise Holdings, Inc. | Implantable devices with reduced needle puncture site leakage |
US8906087B2 (en) | 2004-11-29 | 2014-12-09 | W. L. Gore & Associates, Inc. | Method of making implantable devices with reduced needle puncture site leakage |
US20100219265A1 (en) * | 2007-07-09 | 2010-09-02 | Tanhum Feld | Water irrigation system including drip irrigation emitters |
US20090053371A1 (en) * | 2007-08-21 | 2009-02-26 | Carolie Hancock | Package for storing, shipping, preparing and dispensing a meal |
CN105829415B (en) * | 2013-11-29 | 2020-06-05 | 大金工业株式会社 | Porous body, polymer electrolyte membrane, filter medium for filter, and filter unit |
CN105829415A (en) * | 2013-11-29 | 2016-08-03 | 大金工业株式会社 | Porous body, polymer electrolyte membrane, filter material for filter, and filter unit |
US9814560B2 (en) | 2013-12-05 | 2017-11-14 | W. L. Gore & Associates, Inc. | Tapered implantable device and methods for making such devices |
US11259910B2 (en) | 2013-12-05 | 2022-03-01 | W. L. Gore & Associates, Inc. | Tapered implantable device and methods for making such devices |
US10357385B2 (en) | 2015-06-05 | 2019-07-23 | W. L. Gore & Associates, Inc. | Low bleed implantable prosthesis with a taper |
US11622871B2 (en) | 2015-06-05 | 2023-04-11 | W. L. Gore & Associates, Inc. | Low bleed implantable prosthesis with a taper |
US20170049928A1 (en) * | 2015-08-17 | 2017-02-23 | Vivex Biomedical, Inc. | Umbilical cord transplant product |
US10413635B2 (en) * | 2015-08-17 | 2019-09-17 | Vivex Biomedical, Inc. | Umbilical cord transplant product |
US11378214B2 (en) | 2020-06-26 | 2022-07-05 | Lawrence Wolf | Coaxial tubing systems with securable spacers |
Also Published As
Publication number | Publication date |
---|---|
ZA81678B (en) | 1982-03-31 |
FI72920C (en) | 1987-08-10 |
NL185906B (en) | 1990-03-16 |
SE448968B (en) | 1987-03-30 |
AT386416B (en) | 1988-08-25 |
DE3153231C2 (en) | 1987-05-21 |
BE887501A (en) | 1981-06-01 |
IN155688B (en) | 1985-02-23 |
FR2475974B1 (en) | 1985-06-21 |
SE8100407L (en) | 1981-08-15 |
DE3104037C2 (en) | 1986-02-27 |
FI810449L (en) | 1981-08-15 |
FR2475974A1 (en) | 1981-08-21 |
DK156419B (en) | 1989-08-21 |
JPS6315904B2 (en) | 1988-04-06 |
NL185906C (en) | 1990-08-16 |
GB2068827A (en) | 1981-08-19 |
NO810506L (en) | 1981-08-17 |
IT1135417B (en) | 1986-08-20 |
CA1165080A (en) | 1984-04-10 |
ATA71181A (en) | 1988-01-15 |
IT8119659A0 (en) | 1981-02-11 |
FI72920B (en) | 1987-04-30 |
GB2068827B (en) | 1983-09-21 |
NL8100672A (en) | 1981-09-16 |
DK156419C (en) | 1990-01-22 |
DE3104037A1 (en) | 1981-12-24 |
AU6714681A (en) | 1981-08-20 |
BR8100852A (en) | 1981-08-25 |
DK63581A (en) | 1981-08-15 |
AU541290B2 (en) | 1985-01-03 |
CH652072A5 (en) | 1985-10-31 |
JPS5746835A (en) | 1982-03-17 |
GR73849B (en) | 1984-05-07 |
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